Email Detail
Show an email
GET /hyperkitty/api/list/[email protected]/email/IX4PCYVOY7JWVHD6OAKDG5JJ5FPPTGQ2/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IX4PCYVOY7JWVHD6OAKDG5JJ5FPPTGQ2/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "IX4PCYVOY7JWVHD6OAKDG5JJ5FPPTGQ2", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/WYQ7ICNUW4OFVQ7PZLJAHTSWYDUOZP4F/", "sender": { "address": "ke5gdb (a) gmail.com", "mailman_id": "bede4222a4a345e8971f03953d4f34b0", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/bede4222a4a345e8971f03953d4f34b0/emails/" }, "sender_name": "Andrew Koenig", "subject": "[amsat-bb] Re: QRP re deux", "date": "2008-12-20T22:34:51Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WYQ7ICNUW4OFVQ7PZLJAHTSWYDUOZP4F/", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "I made my first 50 or so AO-51 contacts using my FT-60 with an offbrand\nequivalent of the Diamond NR770HA.\n\nI quickly figured out that it was not a game of power for me, since at the\ntime I did not have a way to use more power, but rather a game of timing.\n\nBTW: With that omni, AO-51 came in at about an S2 at the most.\n\nOn Sat, Dec 20, 2008 at 6:51 AM, Michael Heim <[email protected]> wrote:\n\n> I'd like to weigh in on this topic with my 2 cents worth, being a long time\n> QRP operator on various bands and modes...\n>\n> I think QRP means soething different depending on what kind of operating\n> you do. On HF, its generally 5 watts into a simple antenna, such as a\n> dipole or vertical.\n>\n> HF digital, there isnt much of a distinction (psk31) as many run 5 watts\n> into a dipole vs maybe 20-30 watts into a similar antenna for QRO?\n>\n> I operate VHF and microwave. to me, on 2m SSB tropo, I consider QRP to\n> be 5-10 watts into whatever and however large an array you can muster,\n> as most QRO stations run 50 watts or more into a similar antenna.\n>\n> EME ops typically defines QRP as anything under about 500 watts or so into\n> a single yagi. (no matter how large that single yagi is)\n>\n> Meteor Scatter I've been called QRP running 50 watts into 10 elements.\n>\n> However, on 10 GHz, I run 2 watts into a 18 inch offset fed dish, and I do\n> NOT consider myself QRP. I'm an \"average powered station\" with that setup.\n> When I ran 200 mW into the same dish, it was questionable even then if I\n> could consider myself QRP. 2 watts = about 2-4KW ERP, 200 mw -= 200-400W\n> ERP. (I havent actually MEASURED the gain, this is calculated ERP)\n>\n> QRP is a relative term. Depending on what kind of operating you do, ERP\n> certainly does take into account whether you're QRP or not.\n>\n> I think in the satellite realm, I would understand QRP to be 5 watts or\n> less into a low gain antenna. Maybe I'm wrong about this, as I'm still a\n> relative newcomer, however This puts everyone on an even keel as far\n> as someone stepping over another to make it fair for everyone. I know there\n> are operators on the main channel that might tweak up the power to get thru\n> on a busy channel. I know, because I have when I started out. I have\n> realised it wasnt right, and now my power stays at 5 watts on the 857. Do i\n> consider myself QRP on AO-51? well, with my homebrew 3 ele/6 ele V/u\n> antenna on a fixed elevation mount, yea, at times I do, when running 5\n> watts. I actually have LESS antenna gain than someone would have with a\n> handheld yagi because the antenna is hardly ever pointing right at the bird.\n>\n> The QRP channel does provide some interesting experimentation like what\n> Tim, N3TL and others have done, exploring \"how low can you go\" and still\n> make contact. To me, THAT is the kind of experimentation that seems like a\n> logical purpose for the \"QRP\" channel.\n>\n> As a side note, hasnt the rule always been to run just enough signal to\n> achieve a downlink of reasonable quality? I remember this from my AO-10\n> days. Too much power on an SSB bird robs power from everyone. Too much\n> power on an FM bird robs others from getting in.\n> Michael Heim\n> Chief Engineer, Forever Broadcasting\n> New Castle PA\n> WKST WJST WWGY\n> 814-671-0666\n> ARS KD0AR\n>\n>\n>\n> ----- Original Message ----\n> From: Sebastian <[email protected]>\n> To: AMSAT BB <[email protected]>\n> Sent: Friday, December 19, 2008 11:10:45 PM\n> Subject: [amsat-bb] Re: QRP re deux\n>\n> I agree 100% with you Jim.\n>\n> If you look at it another way. Standing on relatively flat terrain\n> with 5 watts from an HT on a simplex channel will give you a mile or\n> so on FM.\n>\n> That same 5 watts from the same HT at the Empire State Building\n> observation deck will give you coverage to several miles, if not\n> several states.\n>\n> Either of those two scenarios, I consider to be QRP.\n>\n> 73 de W4AS\n> Sebastian\n>\n> On Dec 19, 2008, at 6:49 PM, Jim Danehy wrote:\n>\n> > the premise that I follow is that QRP in the ham fraternity for\n> > decades prior to AMSAT was 5 watts output from the final stage of\n> > the transmitter . . . any other attempt which hopes to replicate\n> > that simplistic approach is speculation based upon a dynamic that is\n> > flawed from lack of accurate measurements . . . and constantly\n> > changing parameters . .\n> >\n> > HAPPY HOLIDAYS\n> >\n> > Jim W9VNE\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n>\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n\n\n-- \nAndrew Koenig\n", "attachments": [] }